Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 691 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
6. 6.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
13. 13.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
15. 15.True or false: to unplug idle chargers saves electricity. (a) False (b) True
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
22. 22.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
25. 25.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
31. 31.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?

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